-- Cleaned up debug printing of the logical algebra.
-- Cleaned up debug printing of the logical algebra.

   Note that some operators names have changed in the XML output:
      * "type_assertion"   -> "type assertion"
      * "staircase_join"   -> "XPath step"
      * "staircase_join_with_duplicates" -> "duplicate generating path step"
      * "document_access"  -> "#pf:string-value"
      * "!ERROR"           -> "error"
      * "trace_msg"        -> "trace msg"
      * "trace_map"        -> "trace map"
      * "rec_fix"          -> "recursion fix"
      * "rec_param"        -> "recursion param"
      * "rec_arg"          -> "recursion arg"
      * "rec_base"         -> "recursion base"
      * "PROXY"            -> "proxy"
      * "PROXY_BASE"       -> "proxy base"
      * "fn:string_join"   -> "fn:string-join"
      * "DUMMY"            -> "dummy"

    Furthermore the types attribute of the schema information was modified:
      * "pre" -> "node"
      * "afrag" and "pfrag" are not printed anymore
      * the trailing whitespace is removed
        (e.g. types="node" instead of types ="pre pfrag ")

-- Extended the constant property printing to print also the constant value.

zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb